Gas stove



lll

Patented pr. 26, 1927.

UNITED STATES GUILFORD S. MORLEY, OF UNIVERSITY CITY, MISSOURI, ASSIGNOR TO MAJESTIC MANU- 1.626,04? PATENT OFFICE.

FOTURING COMPANY, OF ST. LOUIS, MISSOURI, .A CORPORATION 0F MISSOURI.

GAS STOVE.

Application filed December 11, 1925. Serial No. 74,694.

This invention relates to improvements in gas stoves, and more particularly to ameans for mixing gas and air before they pass from the burner of a stove. The burner herein.

disclosed is of the type shown by the pat.

ents to Harris, 742,643, Oct. 27, 1903, and Roe, 588,532, August 17 1897. A mixture of gas and primary air is discharged into a combustion chamber and secondary air is added to the mixture. One of my objects is to provide an adequate delivery of secondary air in such a manner that a large volume of Secondary air is thoroughly mixed with the gas.

I prefer to `^accomplish this partly by discharging secondary air from a nozzle surrounded by a gas nozzle, and have found this to be considerably more effective than asimilar arrangement with the gas nozzle at the center. More specifically stated, the burner hereafter described'inclu'des a central secondary air nozzle, a gas nozzle surrounding the central air nozzle, and a secondary vair passage around 4the gas nozzle.

' The gas is therefore discharged around a core of'secondary air, and another body of secondary air is discharged around the gas. The gas is thusA interposed between two streams of secondary air, and the streams are united as will be hereafter described to thoroughly mix the gas with the secondary air.

Another object is to produce an effective means for mixing gas with primary air before the gas enters the burner.

Fig. I is a horizontal section taken through the combustion chamber of a gas stove embodying the features of this invention.

Fig. II is afront elevation of the upper portion of the stove showing the secondaryair regulator.

Fig. III is a vertical section showing thc 4combustion chamber andthe secondary-air compartment below the same. e

Fig. IV is an enlargedv vertical section through the` burner. l Fig. V is a sectionon the line V-V in Fig. VI, showing. onevof the inlets for gas and primary air.

Fig.,VI is an enlarged horizontal-section showing portions ot the burner.

Fig. VII is a top view of the burner with the cover removed.

The combustion chamber shown by Figs.

I, II and III comprises a front wall 1, a rear wall 2, side walls 3, a top 4 an'd a bottom 5, the latter being'covered with refractory material 6 having a central opening in which the burner is mounted. The bottom 5 has a central opening below the burner, and the latter is provided with peripheral lugs 7 (Figs. I, IV and VII) resting upon said bottom 5. An outlet 8 for products of combustion (Fig. I). is formed at the rear of the 'combustion chamber, and the rear wall 2'is with inlet ports 12 (Fig. II), and a damper 13 slidably mounted on the front of the stove is provided with similar ports adapted to register with the ports 12. This damper can be adjusted to regulate the admission of secondary air to the-burner and attention is directed to the fact that it l1es in the course of the secondary air passing to the burner. and not in a Hue through which products cf combustion pass from the burner. After the stove 'has been installed and connected to a flue (not shown), the burneris tested, and v1f the draft is too great for the secondary air, the damper 13 isladjusted to obtain the desired condition.

The burner comprises a bottom Wall 14, a top wall 15, a circular outer side wall 16 provided with the supporting lugsl 7, and a circular partition wall 17 between'the concentric inner and outer compartments of the burner. As shown most clearly by Figs. IV, VIand VII, the inner compartment 1s provided with an arcuate wall 18 separated f from the partition 17 to provide a vertical air passage 419 through which air rises from the space below the burner. Connecting webs 2() (Fig. VII) extend from wall 18 to partition 17'.

Each of the two concentric compartments in the burner is provided with a delivery pipefor the admission of a mixture of as and lprimary air. The inlet duct 22 (Figs.

V, VI and VII) for the central compartment lies above the bottom wall 14 as shown in Fig. V, to permit free circulation of gas and primary VVair in the annular outer compartment.

A cover 24, arranged over the burner, is

lprovided with a downturned peripheral flange 25 separated from the outer wall 16 of the burner (Fig. IV) to provide a verticalv passage through which air rises from the secondary air chamber below the burner. This flange fits onto the lugs 7 as. shown in Fig. IV. The top of the cover 24 is provided with discharge orifices 26, and said cover is preferably separated from the top of the burner to form a secondary air passage which receives air from the vertical pasaround one of the air nozzles 27, the latter being centrally located relative to the surrounding gas ports. These ports are directly below a discharge orifice 26 (Fig. IV) and they lie very close to the discharge end of the central a1r nozzle 27.

When the burner is in service, the mixture of gas and primary air is projected from the ports 29 andthrougn the discharge ori'- fices 26. Attentionv is directed to the .manner in which a large supply of secondary air is transmitted to the mixture discharged from ports 29. The ports are preferably inclined (Fig. IV) to converge toward the center of'a discharge orifice 26 and the mixture discharged therefrom tends to' draw `secondary air through said orifice. The

draft resulting from the products of comtends to draw secondary air from the coml, partment belowthe burner. The secondary -air from each nozzle 27 is discharged at the center of a circular series of gas ports 29, and these ports are surrounded by the secondary air. passage between the cover 24 and the top of the burner. The mixture of gas and primary air is therefore discharged between two streams of secondary air, and the resultant mixture'passes through a discharge orifice 26. An ample supply of secondary air to provide most effective combustion is thus delivered to and thoroughly mixed with Athe gas land primary air.

The means for mixing the gas andprimary airis shown in Figs. I, III, VIII and IX. It comprises two mixing devices, one for each of the delivery pipes, lor ducts, 21. Each of these mixing devices includes a down-duct 30 open to the atmosphere at its upper end and leading to the lower end of an up-duct 31 which extends upwardly to .the horizontal delivery duct 21, the upper downwardly I duct 31 to the delivery duct 21, and the gas is projected from nozzle 32 to the duct 31 where it mixes with the air. AOne of the objects of this feat-ure is to thoroughly mix an ample amount of rimary air with the gas, and attention is directed to the relative areasof the several ducts. A large supply of air. can readily How through the large air 'bduct 30 (Fig. VIII), and the gas is projected through the more restricted duct 31 Where it -serves to draw in the4 air. vThe velocity inthe restricted duct 31 'is relatively high, and this results in a desirable condition for the mixing of the air and gas as well as an effective suction to draw in lche air. After being united under pressure and at a high velocity in the restricted duct 31,

the mixture of air and gas is turned abruptly in the bend at the upper end of said restricted duct, and then delivered into the relatively large delivery duct 21, where the velocity is decreased and some expansion occurs, the mixing operation being` prolonged while the gas passes through the delivery duct 21 to the burner. The diierent conditions in this mixing device are favorable to the mixing-of the air and gas, and the delivery of air will be automatically varied in response to variations in the velocity of bustlon using 1n the flue (not shown) also the gas.

To regulate the admission of air to duct 30, its entrance is provided with a valve, or damper, 36 movab e toward and away from the intake'end of the duct. A stem 37, ex-v tending from the valve 36, is screwed into a. rrbl to permitadjustment of saidvalve.

1.Y A gas burner provided -with a central air port from which secondary air is discharged, a circular series of gas ports formed around and adjacent to said central air port, means whereby a-mixture of gas los and primary air is dischar ed from said gas ports to commingle with t e air from said central air port, and a cover having an orifice of a diameter larger than the diameter of said central air portabove said air ports` and gas ports, a secondary air passage be# ing formed between said'cover and the body ot' the burner to provide for the delivery of additional air to said orifice, andsaid central air port, gas ports and air passage bein communication with each other at points below said cover.

2. A gasburner having a gas chamber through which a mixture of gas and primary air is transmitted, said chamber being provided at the top with gas ports for the discharge of said mixture, a cover arranged over said gas chamber and separated therefrom to provide an air passage between the bottom of the cover and the top of said chamber, said cover being provided with discharge orices constituting the sole discharge passageway from said chamber directly above said O'as ports, said chamber having airfnozzles irectly below the centers of the discharge orifices in said cover, and means whereby secondary air is transmitted to said air passage and air nozzles to provide for the delivery of air to opposite sides of each of said gas ports7 the discharge oriices in said cover being of larger diameter than the diameter of said air nozzles.

In testimony that I claim the foregoing I hereunto aix my signature.

GUILFORD S. MORLEY. 

